What's next for WoW instances?

Well, 2.1 has come and gone. A few people have beaten Hyjal and the Black Temple, rather more people are riding their new netherdrakes and nether rays around, and Worldofraids is already wondering: what's next? Blizzard hasn't even announced their next expansion, so it's a safe bet there's going to be a lot more dungeons before patch 3.0. The only semi-confirmed dungeon is the troll area of Zul'Aman, which is probably going to be another 10-man. Gee, great, another troll dungeon full of my allies mistaking me for a mob and trying to click on me. Other possibilities include:

Grim Batol, the fortress in Wetlands guarded by the Red Dragonflight. What's hiding in there -- is it just Alexstrasza and her brood, or are they keeping Deathwing chained up?

The Sunwell Plateau, the island north of Silvermoon where Arthas originally raised Kel'thuzad.

The Stormwind Vault, the prison that lies opposite the Stockades, used for extremely dangerous demons and mages. I don't know how Horde would get in here -- teleportation?

Other guesses are a Kil'jaeden 25-man and about a thousand different things in the Caverns of Time (Fall of Gnomeregan, Siege of Stormwind, etc.) What instances would you like to see? Do you think that Blizzard should now focus on more 10-man and 5-man content, or would you like to see raids progress beyond Black Temple?